The reason why you don't like what you are seeing is because the font mellel is showing you is not "David" but "Times New Roman" in all three examples you've shown. As a matter of fact "David" looks beautiful in mellel (as it is meant to look!). The reason why you are not seeing what you would like to see is because your primary font is probably "Times Roman" and you don't have a secondary font for the appropriate language (in this case Hebrew) set up.

If you are only writing in Hebrew, set your primary language and font to David. But it you primarily write in a language like english chose any font you like for english in the character palette and then go to options and chose as your secondary language Hebrew, and as your secondary font "David." You can give it any size you want, regardless of what the size of your primary language is. If you like the results you can set it as a permanent style.

Thanks for your reply.
I am a long time Mellel user but I forgot some of the basic configurations of Mellel including those of the primary and secondary fonts.
I found this tutorial which explains, not successfully for me, how to do it, here:https://www.mellel.com/mellel-flare/Con ... 20Font.htm

Hi Raymond, it's kind of difficult looking into this with just the screen capture - can you please open a support request and attach the original Mellel and Word files that you were having these issues with?

It looks like you simply work with two different zoom levels. Mellel and Word both allow you to look at your paper at different sizes. In Mellel you can adjust the zoom at the bottom left of your Mellel window. There you’ll find a field that displays 75% 100% or 128% or a similar percentage value. If you click that number, you can set it to a desired zoom level. In Word, you’ll find that setting at the lower right of the window.